Vaporizing carburetor



Feb. 22 1927.

H. E. LARKIN VAPORIZING CARBURETOR Filed July 30, 1923 mar /Z122,

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M v ///A/ 9 0 v H 5 Patented Feb. 22, 1927.

PATENT OFFICE.

HOWARD E. LARKIN, OF BATON, NEW MEXICO.

VAPOBIZING .CABBUBETOR.

Application filed July 30, 1923. Serial No. 654,687.

This invention relates to a vaporizing carburetor for using either gasoline or kerosene, one of the objects of the invention being to provide novel means for effecting a mixture of the vapor with air.

Another object is to provide the carburetor with novel means for vaporizing the liquid fuel, thereby to materially aid in starting an engine in cold weather.

A still further object of the invention is to provide means for feeding liquid fuel to the mixing chamber of the carburetor, such means serving to' prevent backfiring in the float chamber of the device. I

A still further object is to provide a vaporizing carburetor with an auxiliary air supply whereby a jet of air will be directed into the carburetor at the point where the vapor leaves the vaporizer, thus acting to more thoroughly break up the liquid fuel and increase the efliciency of the mixture.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention. In the accompanying drawing which is a vertical section through the vaporizing carburetor, the preferred form of the invention has been shown.

Referring to the drawing by characters of reference, 1 designates the mixing cham ber of the vaporizing carburetor. 2 designates the air inlet and 3 designates the float chamber. Formed .on the top 4 of the float chamber is a nozzle 5 having a tappered head or enlargement 6 at its free end. this nozzle being supported within the mixing chamber 7 in the carburetor. A tubular stem '8 projects from the top 4 of the float chamber down into the float chamberclose to the bottom thereof and the passage in this stem constitutes a continuation or a pas sage 9 formed in the nozzle 5. That'end of passage 9 opening through the head of the nozzle is reduced in diameter as shown'at 10 and opening into that portion of th'e'passage in the head 6 is a supplemental air inlet 11 That portion of the nozzle 5 between the top 4 and the head 6 constitutes a vaporizer and is surrounded by an electric heating coil 13 which can be supplied with current from a battery, not shown, the current merely being sufliciently to provide enough warmth to keep the nozzle heated so as to vaporize the fuel passing therethrough.

wick 14 formed of asbestos completely fills the stem 8 and the passage 9, up to the air inlet 11, the lower end of this wick being preferably supported below stem 8 and close to the bottom of the float chamber.

A liquid fuel inlet port 15 opens into the bottom of the float chamber and is adapted to be closed by -a valve 16 located at the lower end of a stem 17. This stem has a ball and socket connection with a plate 18 pivotally mounted in the upper portion of the float chamber upon a pivot pin shown at 19. This pin is stationary in the wall of chamber 3 and the plate 18 turns upon it. A float 20 is secured to and moves with the plate and has a central opening 21 through which the stem 8 projects. This opening is sufficiently large to allow the float to have a limited swinging movement relative to the stem. The.

float is mounted off .the center so that when the level of the fuel in the chamber 3-falls below a predetermined point that part of the float at the right of pivot 19 in the drawing will swing downwardly by gravity to cause that portion of the plate 18 to the left of pivot 19 to pull upwardly on stem 17 and lift valve 16 from its seat. Thus a new supply of liquid fuel will be admitted to the chamber 3. When the level of the liquid rises-to a certain point in the float chamber. the float will shift so as to force valve 16 onto its seat. thereby cutting off the further flow of fuel to the chamber.

The air in the portion 2 of the vaporizing carburetor has a flap valve 22 pivotally mounted therein at 23, there being an arm .24 outside the vaporizing carburetor and screw, the tension of the spring can be increased or reduced. Thus the opening of the valve 22 can be regulated. This valve is to be opened by the section of the engine to which the carburetor is applied.

A choke valve 29 is located in the air inlet portion 2 and the usual butterfly valve 31 is provided in the outlet portion 1.

It is designed to make the walls of the carburetor, the float chamber and the nozzle out of aluminum which will provide a light structure constituting an efiicient heat conductor. The liquid fuel contained within the fioat chamber 3 will be supplied by ca illary attraction through wick 14 to the re uced ortion 10 of the passage in nozzle 5. As uel asses through the nozzle, it will be heated by the coil 13 and the vapor leaving the end of the wick will be met by the inrushing air currentsupplied through the intake 11. This will result in agitating the va ly wit the air, than would other wise be possible. As the air rushes into passage 9 rom the intake 11, it will rebound from the wall of the passage close to the end of of the float chamber for conductin the wick, this rebounding action resulting in the thorough mixing of the air and gas and the a 'tation of the vapor as before explained. he operation of the float 20 has already been described.

A vent .30 may be provided in the top 4 vapor from the top of said chamber into t e mixing chamber 7. This vent also allows the float chamber to be filled with "fuel. The vent can be supplied with a suitable check valve, not shown.

What is claimed is:

1. In a vaporizing carburetor, the combination with a mixing chamber having an air intake and a vaporized fuel outlet, of a float chamber, a fuel vaporizing nozzle extendin from the float chamber into the mixing c amber, said nozzle having a stem projecting into the float chamber and having a passage through the nozzle and stem, a wick within the passage and terminating inwardly from the outlet end thereof, and a supplemental air intake extending radially extendin r so that it will mix more thorough into the nozzle. and openin into the passage close to the end of the wi s.

2. In avaporizing carburetor, the combination with a mixing chamber having an air intake and a .va rized fuel outlet, of a float chamber, a Kiel vaporizing nozzle from the float chamber into the mixing c iamber, said nozzle having a stem within the float chamber and having a passage extending through the nozzle and stem, a heatin coil surrounding the nozzle, a wick withint1e passage in the stem and nozzle and terminating inwardly from the outlet end of the "passage, an air intake opening into said assa e at right angles thereto and close to e end of the wick, and means for controlling the flow, of air through said last named air intake.

3. in a vaporizing carburetor, the combination with a mixing chamber having a valved air inlet and a valved va orized fuel outlet, of a float chamber, a fue vaporizing nozzle extending from said chamber into the mixing chamber and having a passage therethrough, a wick in the passage and terminating inwardly from the outlet end thereof, a supplemental air intake openin into the passage at right angles thereto an close to the end of the wick, a heating coil extending around the nozzle, and means for controlling the fiow of air through the supplemental intake.

4. In a vaporizing carburetor, the combination with a mixing chamber having air intake and a vaporized fuel outlet, of a float chamber, a top secured thereto, a fuel vaporizing nozzle on the top projecting into the mixing chamber and having a passage therethrough, a wick within the passage and terminating inwardly from the outlet end of the passage, a supplemental air inlet opening into said passage at an angle thereto close to the end of the wick, means for controllin the flow of air through said in let, and oat controlled means in the float chamber for supplyin fuel to the wick.

In testimony that claim the foregoing as my own, I have hereto aflixed my signature.

HOWARD E. LARKIN. 

